griffin



(No Model.) 3 Sheets-Sheet I.

J. S. GRIFFIN. MACHINE FOR ROLLING HOLLOW RODS 0R BARS.

No. 468,655. Patented Feb. 9,1892.

7 N M Ti NE o R N 3i j -1 H \H I mm 1:: Q T 0 NE U 3 y 1 D Q WITNESSES JQM Arm/mm:

(No Model.) 3 Sheets-Sheet 2.

J. s. GRIFFIN. MACHINE FOR ROLLING HOLLOW RODS 0R BARS.

' Not 168,655. Patented Feb. 9,1892.

WITNESSES IN VENTOH ATTORNEYS (No Model.) a Sheet-Sheet 3.

J. S. GRIFFIN. v MACHINE FOR ROLLING HOLLOW RODS 0R BARS No. 468.655. Patented Feb. 9, 1892.

INVENTOH: B)

ATTORNEYS UNITED STATES JOHN STEIVART GRIFFIN, OF ROSLYN,

PATENT OFFICE.

IVASHINGTON.

MACHINE'FOR ROLLING HOLLOW RODS OR BARS.

SPECIFICATION forming part of Letters Patent No. 468,655, dated February 9, 1892. Application filed February 10, 1891- Serial No. 380,991.- (No model.)

Bars, of which the following is a full, clear,

and exact description.

The object of the invention is to provide a new and improved machine for manufacturing hollow rods or bars from previously-heated hollow ingots, the said machine being very simple and durable in construction, very effective in operation, and producing a very durable and simple tube of a uniform size.

The invention consists of pairs of horizontal reducing-rolls and a pair of disks arranged between each-two adjacent pairs of reducing and stationary guides between the said pairs of rolls and disks.

The invention also consists of certain parts and details and combinations of the same, as will be hereinafter fully described, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan view of the improvement with the guides removed. Fig. 2 is a longitudinal section of the same on the line at wof Fig. 1. Fig. 3 is an enlarged elevation of the inlet end of the same, the guide or feed rolls being removed. Fig. 4 is an enlarged transverse section of the improvement on the line y y of Fig. 2, parts being removed. Fig. 5 is an end elevation of the discharge end of the improvement. Fig. 6 is a sectional side elevation of the stationary guides separated one from the other, and Fig. 7 is a sectional side elevation of the same as assembled on the line 2 z of Fig. 6.

The improved machine is provided with a suitable base A, on which are erected pairs of standards 13 B B B placed one in front of the other, as is plainly illustrated in the drawings. In suitable bearings B, held in the pairs of standards, are mounted to turn pairs of rolls 0 C, C 0 0 C and C C Each of the rolls is formed with several annular curved grooves O of varying sizes for reductogether by gear-wheels D D, one of the brackets G G, secured on the base A. The

axis of the shafts F F is midway between the two rolls of each pair, so that the ingot passing through the annular groove 0 of the rolls'passes centrally between the faces of the disks E E. The disks E E are somewhat beveled at their faces, the beveled part being serrated, so as to twist the ingot when the latter passes between the two disks. In order to facilitate the twisting, the two disks are mounted to turn in opposite directions, the shaft F of the disk E being for this purpose provided with a gear-wheel F in mesh with a a gear-wheel D secured on the shaft D of the lowermost roll of the pairs of rolls, as is plainly illustrated in Figs. 1 and 3. The shaft F of the disk E carries a gear-Wheel F in mesh with a gear-wheel D on the shaft D of the uppermost roll of the pairs of rolls.

In order to move the two disks E and E in line with the respective annular groove C through which the ingot is to pass, the shafts F and F of the said disks are fitted to slide transversely, each shaft being provided for this purpose near its outer end with an annular groove F engaged by a correspondingly-shaped tongue on blocks F fitted to slide laterally in suitable guideways in the brackets G or G. Each of the blocks F is formed with a thread engaged by a screw-rod F, mounted to turn in the respective bracket G or G, so that when the screw-rods are turned the blocks F slide laterally inward or outward, according to. the direction in which the screw-rods F are turned.

I11 order to take up the lateral strain on the shafts F F, a screw F is provided, screwing in the outer end of the respective bracket G or G against the outer end of the respective shaft F or F, as is plainly illustrated in Fig. 1. It is understood that the screws F are unscrewed, so as to permit adjusting of the blocks F as previously described, to shift the respective shaft F or F laterally. The

' guides H and II, located one above the other and extending between the disks E and E. The guides H and H are formed at their opposing sides with segmental faces corresponding to the size of the bar or rod to be drawn or passed along the guides,the bar or rod being engaged at the same time between two disks E and E, which, as previously described, serve to twist the same.

The guides H and H are held in transversely-extending bars I and I, respectively, of which the lower one I rests on suitable hearings in the respective pair of standards, while the upper one is pressed downward by set-screws I screwing in the respective pair of standards. In order to retain the guides II and H in place, they are notched at'the ends to engage the corresponding bars I and I. The guides have to be moved laterally in case the disks E and E are moved in the same direction, when the bar or rod passes through another pair of annular grooves O of the red ucin g-rolls.

In order to prevent displacement of the bar or rod to be reduced after leaving the outer end of the respective disks E and E and beforereaching the next pair of reducgag-rolls, guide-blocks J and J are provided, fitted to slide in the bars I and I, said blocks being arranged at right angles to the guides II and II and formed with curved inner faces J which, with the curved faces H of the guides H and H, form a complete circle between the disks E and E and the adjacent reducing-rolls. The outer ends of the guides H and H are curved, as shown at J 3 in Fig. 7, to conform to the shape of the reducingrolls, as is plainly shown in Fig. 2. Thus a bar or rod passing from one pair of rolls to another is firmly guided between the guides H and H and the blocks J and J, so that the disks E and E can conveniently twist the bar or rod without fear of displacing the latter between adjacent pairs of reducing-rolls.

At the discharge end of the machine that is, next to the pairs of reducing-rolls C and O is arranged apair of finishing-rolls K and K, fastened on shafts K set vertically and mounted to turn in suitable bearings L, fitted to slide in the guideways N, formed on a frame N, secured to the last pair of standards B and resting on the base A. The finishing-rolls K and K have to be moved laterally, so as to bring the rolls in line with the respective pair of grooves (J through which the bar or rod passes. For this purpose the bearings L are provided with screw-threads in which screw the screw-rods L, mounted to turn in the frame N, so that when the said screw-rods are turned the bearings with the rolls K and K move laterally to the desired position. In order to take up the lateral strain on the bearings L, set-screws L are provided, screwing in the ends of the frame N againstthe said bearings. (See Fig. 1.)

On the lower ends of the shafts K of the finishing-rolls K and K are secured the beveled gear-wheels K each meshing in a beveled gear-wheel K, securedon the shaft K mounted to turn in suitable bearings in the lower part of the frame N ,the said shaft K extending transversely and being connected by a gear-wheel K with the gear-wheel D of the preceding shaft D, which, when rotated, imparts a rotary motion to the said shaft. Vhen the shaft K is turned, the two gearwheels K by meshing with the gear-Wheels K rotate the shafts K so that the two fin-.

ishing-rolls K and K" rotate in unison.

In order to conveniently guide the ingot to the first pair of reducing-rolls C and 0', two pairs of feed rollers O O are preferably mounted to turn in suitable bearings P and P, respectively held in brackets Q, secured to the first pair of standards B. The bearings P are held vertically adjustable by suitable set-screws P The shafts of the feedrollers O are geared together, one of the shafts being driven in a suitable manner, so that all the feed-rollers rotate in unison in such a manner as to draw the ingot toward the reducing-rolls O O.

The annular grooves O of the several pairs of reducing-rolls C O, C 0 0 C and O 0 diminish somewhat in size from the front end of the machine to the rear end of the same, so that an ingot passing successively through the several pairs of rolls is reduced to the proper size, so that in its finished state it finally passes through the finishing-rolls K and K, which remove any unevenness which may be found on the outside of the tube.

The operation is as follows: The previouslyheated hollow ingot is passed onto the feedrollers O O, which deliver the ingot to the first pair of reducing-rolls O O, which reduce the ingot, which passes then between the first pair of blocks J and J 2 to the longitudinally-extending guides H and H, and between the first pair of disks E and E, which, by their serrated beveled faces and by their rotating in an opposite direction, twist the bar or rod, at the same time moving it for- IIO ward so that it is rolled and twisted, to be finally guided by the next pair of blocks J to the second pair of reducing-rolls 0 G which again reduce the bar or rod and move it forward to be treated in asimilar manner by the next pair of disks and guides, to pass then to the third pair of reducing-rolls O 0 then through the last pair of disks and dies to the last pair of red ucing-rolls C 0 in which the bar or rod is about reduced to the proper size, and then passes into the finishing-rolls K and K, which remove any irregularities which may then be upon it. It is understood that,

all the rolls and disks are rotated in unison, being driven by suitable machinery by suitable means.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a machine for rolling hollow bars or rods, the combination, with pairs of reducingrolls, of a pair of disks arranged between each two adjacent pairs of reducing-rolls for twisting the material passing between them, as shown and described.

2. In a machine for rolling hollow bars or rods, the combination, with pairs of reducingrolls, of a pair of disks arranged between each two adjacent pairs of reducing-rolls, the said disks being mounted on shafts inclined to the axes of the reducing-rolls and turning in 0pposite directions, and stationary guides arranged between two adjacent pairs of rolls and disks, substantially as shown and described.

In a machine for rolling hollow bars or rods, the combination, with pairs of reducingrolls, of a pair of disks arranged between each two adjacent pairs of reducing-rolls, the said disks being mounted on shafts inclined to the axes of the reducing-rolls and turning in opposite directions, stationary guides arranged between two adjacent pairs of rolls and disks, and a pair of finishing-rolls arranged vertically, substantially as shown and described.

at. In a machine for rolling hollow bars or rods, the combination,with pairs of horizontal reducing-rolls mounted to turn in unison, each roll being provided with a series of differentsized annular curved grooves, of a pair of disks between each two adjacent pairs of ducing rolls,said disks being mounted on shafts inclined to the axes of said rolls, and means, substantially as described, for adj usting the said pair of disks laterally to bring the disks in line with the respective annular grooves on the said reducing-rolls to be used for reducing the bar or rod, substantially as set forth.

5. In a machine for rolling hollow bars or rods, the combination, with pairs of horizontal reducing-rolls arranged one pair in front of the other, of a pair of disks between each two adjacent pairs of reducing-rolls, said disks being mounted on shafts inclined to the axes of the reducing-rolls and geared with the said reducing-rolls in such a manner thatthe disks rotate in opposite directions, substantially as shown and described. V

6. In a machine for rolling hollow bars or rods, the combination, with reducing-rolls and twisting-disks between the rolls, of a pair of fixed or stationary guides between the rolls, and a pair of blocks arranged opposite each other at right angles to the said guides, substantially as shown and described.

7. In a machine for rolling hollow bars or rods, the combination, with red ucing-rolls and twisting-disks, of a pair of fixed or stationary guides between the rolls, a pair of blocks arranged opposite each other at right angles to the said dies, and means, substantially as described, for adjusting the said guides and blocks laterally, as set forth.

JOHN STElVART GRIFFIN. Witnesses:

J. M.- HOAGLAND, JOSEPH OSTLIPP CLAnk. 

